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Re: [aspectj-users] proxying subclasses
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Hi !
If I understand you, you can use perthis. Here is a quick snippet of
code. WARNING: Syntaxis not tested, perhaps you'll need to refine the
idea too.
/* This creates a FooStub instance per each Foo instance */
public aspect FooStub implements Foo perthis(this(Foo+&&(!FooStub)))
{
/* Add here implementation for Foo methods */
}
/* This intercepts all calls to Foo objects except FooStub and redirects
them to the stub */
public aspect FooInterceptor
{
pointcut interceptSomeMethod(Foo instance, /* parameters of
someMethod */): call(Foo+.someMethod(..))
&& this (!FooStub)
&& this(instace)
&& /* extract
parameters of some method */;
void around(Foo instance, /* parameters of someMethod */):
interceptSomeMethod(/* etc */)
{
/* Get the FooStub instance associated to instance*/
Foo stub=FooStub.aspectOf(instance);
stub.someMethod(/*parameters here*/);
}
}
Hope this helps you !
Enrique J. Amodeo Rubio.
Jeffrey D Palm wrote:
Wes Isberg wrote:
Normally you can supply a stub/mock/proxy as follows:
Foo around() : call(Foo.new(..)) {
return FooStub.create(thisJoinPoint.getArgs());
}
but this fails to handle subclasses, esp. anonymous ones:
void someMethod() {
Foo me = new Foo("foo") {
public String toString() { return "bar"; }
};
}
OK, my last message was pretty convoluted. But why not, instead of
creating a proxy via FooStub, just created on with advice. That is,
intersept the calls you'd like to replace by using a proxy with around
advice, instead of actually creating a proxy object?
Jeff
The only alternative seems to be some combination of advising all the
target method-call and field g/set join points, or using
declare-parents to interpose the stub:
declare parents (Foo+ && !Foo) : FooStub;
Both of those have their own drawbacks.
Can anyone think of a good workaround?
Wes
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